Source of Sonata XI “pour le Violon et pour la Flute Traversiere avec la Basse Continue” is a 1728 printed edition by Boivin & Leclerc of the “Second livre de Sonates” by Leclair. The edition is available at Gallica, BNF, Paris. A very accurate handwritten copy of the same sonata is at the Copenhagen Royal Library, Giedde's Collection.